Hearth-tray vibrator



`Dec. 13, 1927.

' A; D. KEENE HEARTH-TRAY VIBRATOR Filed Jan. 14. 1927 WITNESSES:

ATTo'RNEY i wall of the furnace.

Patented Dec. 13, 1927.'

UNITE-n stares PATENT, "Q'Fflti ALVIN D. KEENE, or MANSNIELD, orario, Assc-Non 'ro wnsrrn'erousn ELECTRIC a MANUFACTURIN@l COMPANY, A ooRronArIoN or PENNSYLVANIA.

HEARTHTRAY visitaron.

Application filed January 14, 1927'. Serial No. 161,065.

My invention relates to furnaces and more particularly to furnaces having a tiltable hearthv tray. v l n An object of my invention is to, provide means for jarringor vibrating'the hearth tray iu its tilted position to facilitate the re- .moval of material therefrom.

Inpracticing my invention, I provide, in conjunction with a tiltable hearth tray in an electric furnace and suitable tilting mechanisi'n therefor, an electronmgnetic" device for vibrating the hearth tray, the energizar tion of said electromagnetic devicebeing controlled by the tray-tiltingV mechanism.

Fig. 1 is an elevation, in section, of an electric furnace embodying my invention; and i Fig. 2 is a development of the drum and cam groove shown in Fig. 1. g

An electric furnace of the rotary hearth type, designated generally as 11, includes:

a frame 12 and layers 13 and 14 of' suitable refractory material forming an annular furnace chamber 15. The hearths 16 are mounted for rotation upon a circular base 17 by means of standards 18 extending through an annular .slot 19 in lthe bottom The base 17 carries a circular rack 20 and is revolved by suitable gearing 21 engaging said rack and driven by a motor22. Heating elements 23 are mounted upon the top and bottom walls of the furnace chamber.

The mechanism for tilting said tray comprises preferably an electric motor which, through suitable gearing 31, rotates a drum 32 in the face of which is cut a cam groove 33 as more clearly indicated in Fig. 2. A rod 34 extends through the top wall of the furnace and into the furnace chamber 15, the upper extremity of said rod engaging said cam groove 33 by means of a pin or roller 35. At the lower extremity of said rod, within the furnace chamber, is pivotally mounted a member 36, of substantially L-shape, one arm 37 of which is positioned to engagethe Vhearth tray and the other arm 38 is positioned to bear against the side wall of the furnace chamber, so that Amovement about the pivot point' is possible in only one direction.

On the exterior of the furnace is iixedly mounted a solenoid 40 within Awhich is located a core'41. A rod 42, integral With or (lll.

ment of rod 34 and member 36' in the ,posi-V` tion shown in F ig. 1. The energization of the solenoid winding is effected through an electric circuit including suitable source of alternating current electrical` energy, such asy conductors 44, and aswitch 45. i. One Contactv carried by a lever 48 pivoted Vintermediate its ends for movement toward and away from the fixed contact. Carried upon the rod 34 is a lug or projection 49 for engagement with the switch `lever 48 when rod 34 Vis vin its raised position.

In operation the cylinder or drum 32 is rotated by means of motor 30, andA as roller 35 of rod 34 rides along the cam groove,rod 34 is raised and member 37 engages the hearth tray 16 to tilt it.. When the lifting movement is practically completed thek portion 38 of the pivoted angle member 36 is in alinement with extension 42 on core 41, and at the same time lug 49 will engage switch lever 48 to cause contact members 46 and 47 to engage and to complete a circuit through the solenoid winding 40.

The energization ofthe solenoid Winding attracts core 41 against the tension of spring 43 and forces extension 42 against arm 38 of the pivoted member 36 which causes vibration of the hearth tray 16. The heated material on tray 16 is therebyV shaken or jolted off the tray and delivered to tank 50 through chute 51. y

Various modifications of my invention are possible without departing from the spirit and scope thereof and I desire that only such limitations be placed thereon as are imposed by the prior art and set forth in the appended claims.

I claim as my invention:

1. .In a furnace, the combination with a hearth tray movable in said furnace, and means for tilting said hearth tray, of electric means energized during a portion only of said tilting movement for vibrating said tray tilting means. l

2. In a furnace, the combination with a hearth tray movable in said furnace, and

motor driven tray tilting` means, of electro` 4G of the switch is fixed and the other 47jv is $1. 111 11 111111111111. 111e. 6111111111111111111 with :1 116111111 11'11y 1110Va111'e in x111111 furnace, 111111 111111111' 1111111111 1111.1' 11111111;l 1111111115, 111 @11m-11'11- 11111g11e111f 111011111'y 1111: 111115211111- 1111111111011 111 5:1111 Huy-11111115 1111111115, 111111 1111111115 01311111111@ by 1111111 tray-111111111 111ec1111111s111 111 11r1111g1z11 $11111 11111f111111111g11e1111111e1111s.

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